<!DOCTYPE html>
<html lang="en">
    <head>
        <meta charset="UTF-8" />
        <meta name="viewport" content="width=device-width, initial-scale=1.0" />
        <title>Document</title>
        <style>
            .container {
                display: grid;
                grid-template-columns: 100px 1fr;
                box-sizing: border-box;
                height: 300px;
            }
            .left {
                background: red;
            }
            .right {
                background: green;
            }
        </style>
    </head>
    <body>
        <div class="container">
            <div class="left"></div>
            <div class="right"></div>
        </div>
    </body>
</html>
